1 /* Build symbol tables in GDB's internal format.
2 Copyright (C) 1986-1991 Free Software Foundation, Inc.
4 This file is part of GDB.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
20 /* This module provides definitions used for creating and adding to
21 the symbol table. These routines are called from various symbol-
22 file-reading routines.
24 They originated in dbxread.c of gdb-4.2, and were split out to
25 make xcoffread.c more maintainable by sharing code.
27 Variables declared in this file can be defined by #define-ing
28 the name EXTERN to null. It is used to declare variables that
29 are normally extern, but which get defined in a single module
30 using this technique. */
36 extern void add_symbol_to_list ();
37 struct symbol *find_symbol_in_list ();
38 extern void read_type_number ();
39 extern struct type *read_type ();
40 extern struct type *read_range_type ();
41 extern struct type *read_enum_type ();
42 extern struct type *read_struct_type ();
43 extern struct type *read_array_type ();
44 extern struct type **read_args ();
45 extern struct type **dbx_lookup_type ();
46 extern long read_number ();
47 extern void finish_block ();
48 extern struct blockvector *make_blockvector ();
49 extern void add_undefined_type ();
50 extern void really_free_pendings ();
51 extern void start_subfile ();
52 extern void push_subfile ();
53 extern char *pop_subfile ();
54 extern struct symtab *end_symtab ();
55 extern void scan_file_globals ();
56 extern void buildsym_new_init ();
57 extern void buildsym_init ();
58 extern struct context_stack *push_context ();
59 extern void record_line ();
60 extern void start_symtab ();
61 extern struct symbol *define_symbol ();
63 /* Convert stab register number (from `r' declaration) to a gdb REGNUM. */
65 #ifndef STAB_REG_TO_REGNUM
66 #define STAB_REG_TO_REGNUM(VALUE) (VALUE)
69 /* Name of source file whose symbol data we are now processing.
70 This comes from a symbol of type N_SO. */
72 EXTERN char *last_source_file;
74 /* Core address of start of text of current source file.
75 This too comes from the N_SO symbol. */
77 EXTERN CORE_ADDR last_source_start_addr;
79 /* The list of sub-source-files within the current individual compilation.
80 Each file gets its own symtab with its own linetable and associated info,
81 but they all share one blockvector. */
88 struct linetable *line_vector;
89 int line_vector_length;
92 EXTERN struct subfile *subfiles;
94 EXTERN struct subfile *current_subfile;
96 /* Global variable which, when set, indicates that we are processing a
97 .o file compiled with gcc */
99 EXTERN unsigned char processing_gcc_compilation;
101 /* Count symbols as they are processed, for error messages. */
103 EXTERN unsigned int symnum;
105 /* Vector of types defined so far, indexed by their dbx type numbers.
106 (In newer sun systems, dbx uses a pair of numbers in parens,
107 as in "(SUBFILENUM,NUMWITHINSUBFILE)". Then these numbers must be
108 translated through the type_translations hash table to get
109 the index into the type vector.) */
111 EXTERN struct type **type_vector;
113 /* Number of elements allocated for type_vector currently. */
115 EXTERN int type_vector_length;
117 /* Hash table of global symbols whose values are not known yet.
118 They are chained thru the SYMBOL_VALUE_CHAIN, since we don't
119 have the correct data for that slot yet. */
120 /* The use of the LOC_BLOCK code in this chain is nonstandard--
121 it refers to a FORTRAN common block rather than the usual meaning. */
124 EXTERN struct symbol *global_sym_chain[HASHSIZE];
126 /* Record the symbols defined for each context in a list.
127 We don't create a struct block for the context until we
128 know how long to make it. */
130 #define PENDINGSIZE 100
134 struct pending *next;
136 struct symbol *symbol[PENDINGSIZE];
139 /* List of free `struct pending' structures for reuse. */
140 EXTERN struct pending *free_pendings;
142 /* Here are the three lists that symbols are put on. */
144 EXTERN struct pending *file_symbols; /* static at top level, and types */
146 EXTERN struct pending *global_symbols; /* global functions and variables */
148 EXTERN struct pending *local_symbols; /* everything local to lexic context */
150 /* Kludge for xcoffread.c */
151 struct pending_stabs {
156 EXTERN struct pending_stabs *global_stabs;
157 EXTERN struct pending_stabs *file_stabs;
159 /* List of symbols declared since the last BCOMM. This list is a tail
160 of local_symbols. When ECOMM is seen, the symbols on the list
161 are noted so their proper addresses can be filled in later,
162 using the common block base address gotten from the assembler
165 EXTERN struct pending *common_block;
166 EXTERN int common_block_i;
168 /* Stack representing unclosed lexical contexts
169 (that will become blocks, eventually). */
173 struct pending *locals; /* Outer locals at the time we entered */
174 struct pending_block *old_blocks; /* Pointer into blocklist as of entry */
175 struct symbol *name; /* Name of function, if any, defining context*/
176 CORE_ADDR start_addr; /* PC where this context starts */
177 CORE_ADDR end_addr; /* Temp slot for exception handling. */
178 int depth; /* For error-checking matching push/pop */
181 EXTERN struct context_stack *context_stack;
183 /* Index of first unused entry in context stack. */
184 EXTERN int context_stack_depth;
186 /* Currently allocated size of context stack. */
188 EXTERN int context_stack_size;
190 /* Macro "function" for popping contexts from the stack. Pushing is done
191 by a real function, push_context. This returns a pointer to a struct
194 #define pop_context() \
195 (&context_stack[--context_stack_depth]);
197 /* Nonzero if within a function (so symbols should be local,
198 if nothing says specifically). */
200 EXTERN int within_function;
202 /* List of blocks already made (lexical contexts already closed).
203 This is used at the end to make the blockvector. */
207 struct pending_block *next;
211 EXTERN struct pending_block *pending_blocks;
213 extern CORE_ADDR startup_file_start; /* From blockframe.c */
214 extern CORE_ADDR startup_file_end; /* From blockframe.c */
216 /* Global variable which, when set, indicates that we are processing a
217 .o file compiled with gcc */
219 EXTERN unsigned char processing_gcc_compilation;
221 /* Setup a define to deal cleanly with the underscore problem */
223 #ifdef NAMES_HAVE_UNDERSCORE
224 #define HASH_OFFSET 1
226 #define HASH_OFFSET 0
229 /* Support for Sun changes to dbx symbol format */
231 /* For each identified header file, we have a table of types defined
234 header_files maps header file names to their type tables.
235 It is a vector of n_header_files elements.
236 Each element describes one header file.
237 It contains a vector of types.
239 Sometimes it can happen that the same header file produces
240 different results when included in different places.
241 This can result from conditionals or from different
242 things done before including the file.
243 When this happens, there are multiple entries for the file in this table,
244 one entry for each distinct set of results.
245 The entries are distinguished by the INSTANCE field.
246 The INSTANCE field appears in the N_BINCL and N_EXCL symbol table and is
247 used to match header-file references to their corresponding data. */
251 char *name; /* Name of header file */
252 int instance; /* Numeric code distinguishing instances
253 of one header file that produced
254 different results when included.
255 It comes from the N_BINCL or N_EXCL. */
256 struct type **vector; /* Pointer to vector of types */
257 int length; /* Allocated length (# elts) of that vector */
260 EXTERN struct header_file *header_files;
262 EXTERN int n_header_files;
264 EXTERN int n_allocated_header_files;
266 /* Within each object file, various header files are assigned numbers.
267 A type is defined or referred to with a pair of numbers
268 (FILENUM,TYPENUM) where FILENUM is the number of the header file
269 and TYPENUM is the number within that header file.
270 TYPENUM is the index within the vector of types for that header file.
272 FILENUM == 1 is special; it refers to the main source of the object file,
273 and not to any header file. FILENUM != 1 is interpreted by looking it up
274 in the following table, which contains indices in header_files. */
276 EXTERN int *this_object_header_files;
278 EXTERN int n_this_object_header_files;
280 EXTERN int n_allocated_this_object_header_files;
282 /* When a header file is getting special overriding definitions
283 for one source file, record here the header_files index
284 of its normal definition vector.
285 At other times, this is -1. */
287 EXTERN int header_file_prev_index;
291 struct subfile_stack *next;
296 EXTERN struct subfile_stack *subfile_stack;